drm/dp_mst: Fix all mstb marked as not probed after suspend/resume

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From: Wayne Lin <Wayne.Lin@xxxxxxx>

commit d63d81094d208abb20fc444514b2d9ec2f4b7c4e upstream.

[Why]
After supend/resume, with topology unchanged, observe that
link_address_sent of all mstb are marked as false even the topology probing
is done without any error.

It is caused by wrongly also include "ret == 0" case as a probing failure
case.

[How]
Remove inappropriate checking conditions.

Cc: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Harry Wentland <hwentlan@xxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 37dfdc55ffeb ("drm/dp_mst: Cleanup drm_dp_send_link_address() a bit")
Signed-off-by: Wayne Lin <Wayne.Lin@xxxxxxx>
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240626084825.878565-2-Wayne.Lin@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/display/drm_dp_mst_topology.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -2929,7 +2929,7 @@ static int drm_dp_send_link_address(stru
 
 	/* FIXME: Actually do some real error handling here */
 	ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
-	if (ret <= 0) {
+	if (ret < 0) {
 		drm_err(mgr->dev, "Sending link address failed with %d\n", ret);
 		goto out;
 	}
@@ -2981,7 +2981,7 @@ static int drm_dp_send_link_address(stru
 	mutex_unlock(&mgr->lock);
 
 out:
-	if (ret <= 0)
+	if (ret < 0)
 		mstb->link_address_sent = false;
 	kfree(txmsg);
 	return ret < 0 ? ret : changed;


Patches currently in stable-queue which might be from Wayne.Lin@xxxxxxx are

queue-6.1/drm-dp_mst-fix-all-mstb-marked-as-not-probed-after-suspend-resume.patch




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